The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.<br>A:sea water<br>B:scavenging air<br>C:lubricating oil<br>D:fuel oil

The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.
A:sea water
B:scavenging air
C:lubricating oil
D:fuel oil

出自：海船船员证

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